The ball is in your ....
The ball is in your court.
The best thing since ... bread.
The best thing since sliced bread.
Let's ... the knot.
Let's tie the knot.
It's a ... of cake.
It's a piece of cake.
Kill ... birds with one stone.
Kill two birds with one stone.
Curiosity ... the cat.
Curiosity killed the cat.
As ... as a rock.
As solid as a rock.
Once in a ... moon.
Once in a blue moon.
It's a ... in the bucket.
It's a drop in the bucket.
Every cloud has a ... lining.
Every cloud has a silver lining.
Cross that ... when you come to it.
Cross that bridge when you come to it.
You're ... up the wrong tree.
You're barking up the wrong tree.
Close, but no ....
Close, but no cigar.
Let ... dogs lie.
Let sleeping dogs lie.
Take it with a ... of salt.
Take it with a grain of salt.
Don't put all your eggs in one ....
Don't put all your eggs in one basket.
... your tongue.
Bite your tongue.
... the hatchet.
Bury the hatchet.
I ... a rat.
I smell a rat.
... the hook.
Off the hook.
Bite off more than you can ....
Bite off more than you can chew.
At the ... of a hat.
At the drop of a hat.
A leopard can't ... its spots.
A leopard can't change its spots.
Feeling ... the weather.
Feeling under the weather.
It's the ... of both worlds.
It's the best of both worlds.
Actions ... louder than words.
Actions speak louder than words.
Burn the ... oil.
Burn the midnight oil.
... on the bandwagon.
Jump on the bandwagon.
It's a ... in disguise.
It's a blessing in disguise.
Sit on the ....
Sit on the fence.
I'll be glad to see the ... of him.
I'll be glad to see the back of him.
She's a ... horse.
She's a dark horse.